4893. suneidésis
Lexical Summary
suneidésis: Conscience

Original Word: συνείδησις
Part of Speech: Noun, Feminine
Transliteration: suneidésis
Pronunciation: soo-nay'-day-sis
Phonetic Spelling: (soon-i'-day-sis)
KJV: conscience
NASB: conscience, conscience', consciences, consciousness
Word Origin: [from a prolonged form of G4894 (συνείδω - aware)]

1. co-perception, i.e. moral consciousness

Strong's Exhaustive Concordance
conscience.

From a prolonged form of suneido; co-perception, i.e. Moral consciousness -- conscience.

see GREEK suneido

HELPS Word-studies

4893 syneídēsis (from 4862 /sýn, "together with" and 1492 /eídō "to know, see") – properly, joint-knowing, i.e. conscience which joins moral and spiritual consciousness as part of being created in the divine image. Accordingly, all people have this God-given capacity to know right from wrong because each is a free moral agent (cf. Jn 1:4,7,9; Gen 1:26,27).

["Conscience (4893 /syneídēsis) is an innate discernment, self-judging consciousness" (A-S).]

NAS Exhaustive Concordance
Word Origin
from suneidon
Definition
consciousness, spec. conscience
NASB Translation
conscience (24), conscience' (4), consciences (1), consciousness (1).

Thayer's Greek Lexicon
STRONGS NT 4893: συνείδησις

συνείδησις, συνειδήσεως, (συνεῖδον), Latinconscientia (literally, 'joint-knowledge'; see σύν, II. 4), i. e.

a. the consciousness of anything: with a genitive of the object, τῶν ἁμαρτιῶν, a soul conscious of sins, Hebrews 10:2 (τοῦ μύσους, Diodorus 4, 65; συνείδησις εὐγενής, consciousness of nobility; a soul mindful of its noble origin, Herodian, 7, 1, 8 (3 edition, Bekker)).

b. "the soul as distinguishing between what is morally good and bad, prompting to do the former and shun the latter, commending the one, condemning the other; conscience": with a genitive of the subjunctive, συνείδησις τίνος, Romans 2:15 (where the idea of συνείδησις is further explained by καί μεταξύ ... καί ἀπολογουμένων (cf. Winers Grammar, 580 (539); see ἀπολογέομαι, 2, and συμμαρτυρέω)); Romans 9:1; 1 Corinthians 8:7 (cf. Winer's Grammar, § 30, 1 a.),; ; 2 Corinthians 1:12; 2 Corinthians 4:2; 2 Corinthians 5:11; Hebrews 9:14 ( τοῦ φαυλου συνείδησις, Philo, fragment, vol. ii, p. 659, Mangey edition (vi., p. 217f, Richter edition)); ἰδίᾳ συνείδησις, 1 Timothy 4:2; ἄλλη συνείδησις equivalent to ἄλλου τίνος συνείδησις, 1 Corinthians 10:29; διά τήν συνείδησιν, for conscience' sake, because conscience requires it (viz., the conduct in question), Romans 13:5; in order not to occasion scruples of conscience (in another), 1 Corinthians 10:28; μηδέν ἀνακρίνειν διά τήν συνείδησιν (anxiously) questioning nothing, as though such questioning were demanded by conscience, 1 Corinthians 10:25, 27; διά συνείδησιν Θεοῦ, because conscience is impressed and governed by the idea of God (and so understands that griefs are to be borne according to God's will), 1 Peter 2:19; συνείδησιν τοῦ εἰδώλου, a conscience impressed and controlled by an idea of the idol (i. e. by a notion of the idol's existence and power), 1 Corinthians 8:7 Rec.; τελειῶσαι τινα κατά τήν συνείδησιν (namely, αὐτοῦ), so to perfect one that his own conscience is satisfied, i. e. that he can regard himself as free from guilt, Hebrews 9:9; ἐλέγχεσθαι ὑπό τῆς συνειδήσεως John 8:9 (ὑπό τοῦ συνειδοτος, Philo de Josepho § 9 at the end; συνέχεσθαι τῇ συνειδήσει, Wis. 17:10); συνείδησις is said μαρτυρεῖν, Romans 9:1; συμμαρτύρειν, Romans 2:15; τό μαρτύριον τῆς συνειδήσεως, 2 Corinthians 1:12. With epithets: ἀσθενής, not strong enough to distinguish clearly between things lawful for a Christian and things unlawful, 1 Corinthians 8:7, cf. 1 Corinthians 8:10; συνείδησις ἀγαθή, a conscience reconciled to God, 1 Peter 3:21; free from guilt, consciousness of rectitude, of right conduct, Acts 23:1; 1 Timothy 1:5 (Herodian, 6, 3, 9 (4 edition, Bekker)); ἔχειν συνείδησιν ἀγαθήν, 1 Timothy 1:19; 1 Peter 3:16, (ἐν ἀγαθή συνείδησις ὑπάρχειν, Clement of Rome, 1 Cor. 41, 1 [ET]); ἔχειν συνείδησιν καλήν, Hebrews 13:18; συνείδησις καθαρά, 1 Timothy 3:9; 2 Timothy 1:3 (Clement of Rome, 1 Cor. 45, 7 [ET], cf. ἁγνή συνείδησις, ibid. 1, 3; καθαρός τῇ συνειδήσει, Ignatius ad Trall. 7, 2 [ET]); ἀπρόσκοπος, Acts 24:16; πονηρά, a mind conscious of wrong-doing, Hebrews 10:22 ((ἐν συνειδήσει ποιηρα, 'Teaching' etc. 4, 14 [ET]); ἀπρεπής, Lucian, amor. 49). συνείδησις καθαρίζεται ἀπό κτλ., Hebrews 9:14; μολύνεται, 1 Corinthians 8:7; μιαίνεται, Titus 1:15 (μηδέν ἑκουσίως ψεύδεσθαι μηδέ μιαίνειν τήν αὑτοῦ συνείδησιν, Dionysius Halicarnassus, jud. Thucydides8ἅπασιν ἡμῖν συνείδησις Θεός, Menander 597, p. 103, Didot edition; βροτοῖς ἅπασιν συνείδησις Θεός, ibid. 654, p. 101, Didot edition; Epictetus fragment 97 represents συνείδησις as filling the same office in adults which a tutor (παιδαγωγός, which see) holds toward boys; with Philo, Plutarch, and others, τό συνειδός is more common. In the Sept. once for מַדָּע , Ecclesiastes 10:20; (equivalent to conscience, Wis. 17:11; cf. Delitzsch, Brief an d. Röm., p. 11)). Cf. especially Jahnel, Diss. de conscientiae notione, qualis fuerit apud veteres et apud Christianos usque ad aevi medii exitum. Berol. 1862 (also the same, Ueber den Begr. Gewissen in d. Griech. Philos. (Berlin, 1872)); Kähler, Das Gewissen. I. die Entwickelung seiner Namen u. seines Begriffes. i., Alterth. u. N. T. (Halle, 1878); (also in Herzog edition 2, under the word Gewissen; Zezschwitz, Profangräcität as above with, pp. 52-57; Schenkel, under the word Gewissen both in Herzog edition 1, and in his BL.; P. Ewald, De vocis συνείδησις ap. script. Novi Test. vi ac potestate (pp. 91; 1883); other references in Schaff-Herzog, under the word Conscience).

Topical Lexicon
Definition and Essence

The Greek term συνείδησις (Strong’s 4893) denotes the internal faculty by which a person discerns moral right and wrong. It is the God-implanted awareness that both accuses and excuses (Romans 2:15), bearing witness to the law of God within. Conscience is not autonomous; it functions under God’s sovereignty and must be informed and purified by revealed truth.

Origin and Role in Human Experience

From Creation onward, humanity was endowed with conscience as part of the imago Dei, enabling even those without written revelation to sense accountability before their Creator (Romans 2:14-15). Thus Gentiles “show that the work of the law is written on their hearts, their consciences also bearing witness” (Romans 2:15). Conscience therefore provides a universal point of contact for gospel proclamation, exposing guilt yet also preparing the heart for grace.

Conscience in Salvation History

1. Old-Covenant worship could not bring final relief: “The gifts and sacrifices being offered were unable to cleanse the conscience of the worshiper” (Hebrews 9:9).
2. The once-for-all sacrifice of Christ achieved what animal blood never could: “How much more will the blood of Christ… cleanse our consciences from dead works to serve the living God!” (Hebrews 9:14).
3. Believers now draw near “with a sincere heart in full assurance of faith, having our hearts sprinkled to cleanse us from a guilty conscience” (Hebrews 10:22).

Conscience and the Work of the Spirit

Regeneration re-orients conscience, yet its sensitivity grows as Scripture and the Spirit illumine truth (2 Corinthians 4:2; 1 Timothy 1:5). The Spirit not only convicts of sin but also assures the believer of integrity when walking in obedience (2 Corinthians 1:12).

Categories of Conscience in the New Testament

• Good / Clear: Paul testified, “I strive always to maintain a clear conscience before God and men” (Acts 24:16; cf. 1 Peter 3:16, 21).
• Weak: New believers may possess an under-informed conscience, easily wounded by questionable practices (1 Corinthians 8:7-12). Mature believers must limit liberty for their sake (1 Corinthians 10:28-29).
• Defiled: Persistent sin dulls moral perception: “To the defiled and unbelieving, nothing is pure, but both their minds and consciences are defiled” (Titus 1:15).
• Seared: False teachers speak “lies in hypocrisy, seared in their own conscience” (1 Timothy 4:2), illustrating the peril of resisting conviction.
• Evil: An uncleansed heart remains haunted by guilt (Hebrews 10:22).
• Blameless: Paul served God “with a clear conscience” even under accusation (2 Timothy 1:3).

Conscience in Christian Liberty and Community

Romans 14 and 1 Corinthians 8–10 develop the ethic of love-governed liberty. Knowledge must be tempered by regard for another’s conscience: “By sinning against your brothers in this way and wounding their weak conscience, you sin against Christ” (1 Corinthians 8:12). Conscience thus shapes communal holiness and unity.

Conscience and Leadership

Church overseers must “hold to the mystery of the faith with a clear conscience” (1 Timothy 3:9). Spiritual authority flows from integrity, not mere position. Leaders vigilant over their own conscience can readily shepherd others (Hebrews 13:18).

Conscience in Worship and Sacrament

Baptism is “an appeal to God for a clear conscience” (1 Peter 3:21), publicly signifying inner cleansing. The Lord’s Supper invites self-examination, aligning conscience with the cross before partaking.

Conscience in Evangelism and Apologetics

Paul commended himself “to every man’s conscience in the sight of God” (2 Corinthians 4:2; 5:11). Gospel proclamation addresses the conscience, awakening awareness of sin and the need for justification. A life aligned with the message lends persuasive power.

Historical Theology

Early church fathers emphasized conscience as the “inner tribunal.” The Reformers underscored sola Scriptura as the supreme norm informing conscience—hence Martin Luther’s stand at Worms. Evangelical revivals likewise highlighted conviction of sin leading to conversion.

Practical Ministry Implications

1. Preach the Word, trusting the Spirit to pierce conscience.
2. Cultivate personal integrity; a compromised conscience saps spiritual authority.
3. Disciple believers to distinguish between Scripture-based convictions and cultural scruples, strengthening weak consciences without despising them.
4. Confront habitual sin early, lest conscience grow dull or seared.
5. Offer the assurance of Christ’s blood to those oppressed by guilt, leading them into joyful service.

Conscience, therefore, is both sentinel and servant—alerting to sin, driving to the Savior, guiding holy living, and safeguarding the church’s witness until the day every heart is laid bare before God.

Forms and Transliterations
συνειδησει συνειδήσει συνειδησεσιν συνειδήσεσιν συνειδησεως συνειδήσεως συνειδήσεώς συνειδησιν συνείδησιν συνειδησις συνείδησις suneidesei suneidēsei suneideseos suneidēseōs suneidesesin suneidēsesin suneidesin suneidēsin suneidesis suneidēsis syneidesei syneidēsei syneidḗsei syneideseos syneidēseōs syneidḗseos syneidḗseōs syneidḗseṓs syneidesesin syneidēsesin syneidḗsesin syneidesin syneidēsin syneídesin syneídēsin syneidesis syneidēsis syneídesis syneídēsis
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Englishman's Concordance
Acts 23:1 N-DFS
GRK: ἐγὼ πάσῃ συνειδήσει ἀγαθῇ πεπολίτευμαι
NAS: good conscience before God
KJV: good conscience before God
INT: I in all conscience good have conducted myself

Acts 24:16 N-AFS
GRK: ἀσκῶ ἀπρόσκοπον συνείδησιν ἔχειν πρὸς
NAS: a blameless conscience [both] before
KJV: always a conscience void of offence
INT: exercise without offense a conscience to have toward

Romans 2:15 N-GFS
GRK: αὐτῶν τῆς συνειδήσεως καὶ μεταξὺ
NAS: in their hearts, their conscience bearing witness
KJV: their conscience also bearing witness,
INT: their conscience and between

Romans 9:1 N-GFS
GRK: μοι τῆς συνειδήσεώς μου ἐν
NAS: I am not lying, my conscience testifies
KJV: not, my conscience also bearing me
INT: me the conscience of me in [the]

Romans 13:5 N-AFS
GRK: διὰ τὴν συνείδησιν
NAS: but also for conscience' sake.
KJV: but also for conscience sake.
INT: on account of the conscience

1 Corinthians 8:7 N-NFS
GRK: καὶ ἡ συνείδησις αὐτῶν ἀσθενὴς
NAS: it were sacrificed to an idol; and their conscience being
KJV: some with conscience of the idol
INT: and this conscience of them weak

1 Corinthians 8:10 N-NFS
GRK: οὐχὶ ἡ συνείδησις αὐτοῦ ἀσθενοῦς
NAS: in an idol's temple, will not his conscience, if he is weak,
KJV: not the conscience of him
INT: not the conscience of him weak

1 Corinthians 8:12 N-AFS
GRK: αὐτῶν τὴν συνείδησιν ἀσθενοῦσαν εἰς
NAS: and wounding their conscience when it is weak,
KJV: their weak conscience, ye sin against
INT: their conscience weak against

1 Corinthians 10:25 N-AFS
GRK: διὰ τὴν συνείδησιν
NAS: asking questions for conscience' sake;
KJV: question for conscience sake:
INT: on account of conscience

1 Corinthians 10:27 N-AFS
GRK: διὰ τὴν συνείδησιν
NAS: asking questions for conscience' sake.
KJV: question for conscience sake.
INT: on account of conscience

1 Corinthians 10:28 N-AFS
GRK: καὶ τὴν συνείδησιν τοῦ γὰρ
NAS: who informed [you], and for conscience' sake;
KJV: and for conscience sake: for
INT: and conscience for

1 Corinthians 10:29 N-AFS
GRK: συνείδησιν δὲ λέγω
NAS: not your own conscience, but the other
KJV: Conscience, I say,
INT: Conscience moreover I say

1 Corinthians 10:29 N-GFS
GRK: ὑπὸ ἄλλης συνειδήσεως
NAS: judged by another's conscience?
KJV: of another [man's] conscience?
INT: by another's conscience

2 Corinthians 1:12 N-GFS
GRK: μαρτύριον τῆς συνειδήσεως ἡμῶν ὅτι
NAS: the testimony of our conscience, that in holiness
KJV: of our conscience, that
INT: testimony of the conscience of us that

2 Corinthians 4:2 N-AFS
GRK: πρὸς πᾶσαν συνείδησιν ἀνθρώπων ἐνώπιον
NAS: man's conscience in the sight
KJV: man's conscience in the sight
INT: to every conscience of men before

2 Corinthians 5:11 N-DFP
GRK: ἐν ταῖς συνειδήσεσιν ὑμῶν πεφανερῶσθαι
NAS: also in your consciences.
KJV: in your consciences.
INT: in the consciences of you to have been revealed

1 Timothy 1:5 N-GFS
GRK: καρδίας καὶ συνειδήσεως ἀγαθῆς καὶ
NAS: and a good conscience and a sincere
KJV: [of] a good conscience, and
INT: a heart and a conscience good and

1 Timothy 1:19 N-AFS
GRK: καὶ ἀγαθὴν συνείδησιν ἥν τινες
NAS: and a good conscience, which
KJV: and a good conscience; which some
INT: and a good conscience which some

1 Timothy 3:9 N-DFS
GRK: ἐν καθαρᾷ συνειδήσει
NAS: of the faith with a clear conscience.
KJV: in a pure conscience.
INT: in pure a conscience

1 Timothy 4:2 N-AFS
GRK: τὴν ἰδίαν συνείδησιν
NAS: in their own conscience as with a branding iron,
KJV: their conscience seared with a hot iron;
INT: the own conscience

2 Timothy 1:3 N-DFS
GRK: ἐν καθαρᾷ συνειδήσει ὡς ἀδιάλειπτον
NAS: with a clear conscience the way
KJV: pure conscience, that
INT: with pure conscience how unceasingly

Titus 1:15 N-NFS
GRK: καὶ ἡ συνείδησις
NAS: their mind and their conscience are defiled.
KJV: mind and conscience is defiled.
INT: and the conscience

Hebrews 9:9 N-AFS
GRK: δυνάμεναι κατὰ συνείδησιν τελειῶσαι τὸν
NAS: the worshiper perfect in conscience,
KJV: as pertaining to the conscience;
INT: being able as to conscience to perfect him who

Hebrews 9:14 N-AFS
GRK: καθαριεῖ τὴν συνείδησιν ἡμῶν ἀπὸ
NAS: cleanse your conscience from dead
KJV: purge your conscience from dead
INT: will purify the conscience of us from

Hebrews 10:2 N-AFS
GRK: ἔχειν ἔτι συνείδησιν ἁμαρτιῶν τοὺς
NAS: longer have had consciousness of sins?
KJV: no more conscience of sins.
INT: having any longer conscience of sins those who

Strong's Greek 4893
30 Occurrences


συνειδήσει — 3 Occ.
συνειδήσεως — 7 Occ.
συνειδήσεσιν — 1 Occ.
συνείδησιν — 16 Occ.
συνείδησις — 3 Occ.

4892
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